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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d40dd33fd98565956edcef4897d612328839889a56abfb337e21b3a176356dc' 
  AND token = 'HK02yvAa2116aK0/XYXUEn9XYW9WxQs6R339I9j7uww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}